Eburnean orogeny
The Eburnean orogeny, or Eburnean cycle, was a series of tectonic, metamorphic and plutonic events in what is now West Africa during the Paleoproterozoic era about 2200–2000 million years ago. During this period the Birimian domain in West Africa was established and structured.[2][3][4]
Eburnian faults are found in the Eglab shield to the north of the West African craton and in the Man Shield to the south of the craton.[5] There is evidence of three major Eburnean magmatic events in the Eglab shield. Between 2210 and 2180 Ma, a metamorphosed batholith was formed in the Lower Reguibat Complex (LRC). Around 2090 Ma, a syntectonic trondhjemitic pluton intruded into the Archaean reelects of the Chegga series. Around 2070 Ma an asthenospheric upwelling released a large volume of post-orogenic magmas.[6] Eburnian trends within the Eglab shield were repeatedly reactivated from the Neoproterozoic to the Mesozoic.[7]
See also
- Geology of Ghana
- Geology of Ivory Coast
- Geology of Mali
References
- Citations
- ^ a b Wright, J.B.; Hastings, D.A.; Jones, W.B.; Williams, H.R. (1985). Wright, J.B. (ed.). Geology and Mineral Resources of West Africa. London: George Allen & UNWIN. pp. 45–46. ISBN 9780045560011.
- ^ Egal 2002, p. 58.
- ^ Wright, J.B.; Hastings, D.A.; Jones, W.B.; Williams, H.R. (1985). Wright, J.B. (ed.). Geology and Mineral Resources of West Africa. London: George Allen & UNWIN. pp. 45–47. ISBN 9780045560011.
- ^ Taylor, Ryan; Anderson, Eric (2018). Quartz-Pebble-Conglomerate Gold Deposits, Chapter P of Mineral Deposit Models for Resource Assessment, USGS Scientific Investigations Report 2010-5070-P (PDF). Reston: US Dept. of the Interior, USGS. p. 9.
- ^ Ennih & Liégeois 2008, p. 78.
- ^ Ennih & Liégeois 2008, p. 80-81.
- ^ Ennih & Liégeois 2008, p. 77.
- Sources
- Egal, Emmanuel (2002). "Late Eburnean granitization and tectonics along the western and northwestern margin of the Archean Kenema–Man domain (Guinea, West African Craton)" (PDF). Precambrian Research. 117 (1–2): 57–84. CiteSeerX 10.1.1.567.209. doi:10.1016/s0301-9268(02)00060-8. Archived from the original (PDF) on 2009-09-20. Retrieved 2012-06-09.
- Ennih, Nasser; Liégeois, Jean-Paul (2008). The Boundaries of the West African Craton. Geological Society. ISBN 978-1862392519.
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- Major plates: African Plate
- Minor plates: Somali Plate
- Microplates: Lwandle Plate
- Madagascar Plate
- Rovuma Plate
- Seychelles Plate
- Victoria Microplate
- Aswa Dislocation
- Broodkop Shear Zone
- Central African Shear Zone
- Chuan Shear Zones
- Foumban Shear Zone
- Kandi Fault Zone
- Mwembeshi Shear Zone
- Todi Shear Zone
- Western Meseta Shear Zone
- Afar Triangle
- Anza trough
- Bahr el Arab rift
- Benue Trough
- Blue Nile rift
- East African Rift
- Gulf of Suez Rift
- Lamu Embayment
- Melut Basin
- Muglad Basin
- Red Sea Rift
- Sangha Aulacogen
- Atbara rift
- Urema Valley
- West and Central African Rift System
- White Nile rift
- Angola Basin
- Aoukar
- Blue Nile Basin
- Chad Basin
- Congo Basin
- Douala Basin
- El Djouf
- Karoo Basin
- Gabon Basin
- Iullemmeden Basin
- Kufra Basin
- Murzuq Basin
- Niger Delta Basin
- Ogaden Basin
- Orange River Basin
- Ouled Abdoun Basin
- Owambo Basin
- Reggane Basin
- Rio del Rey Basin
- Sirte Basin
- Somali Coastal Basin
- Taoudeni Basin
- Tanzania Coastal Basin
- Tindouf Basin
- Turkana Basin
- Aïr Mountains
- Atlas Mountains
- Aurès Mountains
- Bambouk Mountains
- Blue Mountains
- Cameroon line
- Central Pangean Mountains
- Chaillu Mountains
- Drakensberg
- Eastern Arc Mountains
- Eastern Rift mountains
- Ethiopian Highlands
- Great Escarpment
- Great Karas Mountains
- Guinea Highlands
- Hoggar Mountains
- Imatong Mountains
- Jebel Uweinat
- Loma Mountains
- Mandara Mountains
- Marrah Mountains
- Mitumba Mountains
- Nuba Mountains
- Rif Mountains
- Rwenzori Mountains
- Sankwala Mountains
- Serra da Leba
- Serra da Chela
- Teffedest Mountains
- Tibesti Mountains
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